8060A
Instruction Manual
5-8
5-7. Main PCB Access
Use the following procedure to gain access to the main pcb:
1. Remove the screw in the center of the ac shield and remove the shield.
2. Using your index finger, lift up the lower right corner of the main pcb
until it is free. Then pull the pcb to the right until it clears the shelf
under the buttons.
Caution
Do not touch or contaminate the plastic insulator that is
attached to the inside of the case bottom. When the
instrument is assembled the insulator makes contact
with the leads on the bottom of the main pcb.
Contaminants could cause undesirable conduction
paths. If the insulator becomes contaminated, clean with
isopropyl alcohol.
3. Reassemble in the logical reverse order and heed the following notes:
a. When reassembling, be sure to put on the ac shield after the main
pcb has been placed in the case bottom. The reason for this is that
the screw which holds down the ac shield has a spring attached. The
spring provides the electrical connection between the top of the ac
shield and the bottom of the shield (under the insulator). If the ac
shield is attached to the main pcb before the main pcb is in the case,
the spring may fold across the insulator and not be in proper
position to make the electrical connection.
b. Be sure to place the green power switch cap over the small black
power switch before sliding the main pcb into the case.
c. Be sure to route the battery-clip wires to the left side of the post
under the backup fuse case.
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